Hydrangea is a perennial grown for its blue blooms, which open in indeterminate and return year after year. Notably, it grows just as well in a container as in the ground. Its indeterminate flowers are a moderate draw for honeybees and native bees.
Zones
Data not available
pH Range
5-7
Sun
Part Sun
Days to Maturity
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What Hydrangea is
Hydrangea grows as a perennial and reaches around four feet at maturity. It blooms blue in indeterminate. It's also well suited to containers.
How to grow Hydrangea
Hydrangea does best in part sun — at least 4 hours of direct sun a day — and soil from pH 5 to 7, on well-drained ground. It needs a growing season of at least 120 frost-free days and about 500 hours of winter chill, which is why climate matters as much as soil.
USDA Zones
Data not available
USDA PHZM 2023
Soil pH
5 - 7
USDA PLANTS Database
Sun
Part Sun
plant_species_v5.csv
Drainage
well (dry spells)
plant_species_v5.csv
Mature Height
4 ft
plant_species_v5.csv
Chill Hours
500+
plant_species_v5.csv
Frost-Free Days
120+
plant_species_v5.csv
Start the season right
Plant hydrangea in part sun with at least 4 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Hydrangea prefers pH 5 to 7 (USDA PLANTS Database). A quick soil test from your local Extension lab tells you whether to add lime or sulfur to land in band.
Water steadily
Keep the root zone evenly moist through establishment. A 2–3 inch mulch layer holds moisture without waterlogging.
Harvest at its peak
Cut hydrangea blooms in the cool of the morning, just as they open, for the longest display.
Good to know
One caution for pet owners — hydrangea is toxic to dogs and cats and horses (moderate severity). Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. (Source: ASPCA.)
Hydrangea offers moderate value to bees and other pollinators. (Source: Xerces Society, Pollinator Partnership.)
Where Hydrangea thrives
Whether hydrangea thrives on a given site comes down to its soil pH, drainage, sun, and frost dates — the conditions that vary parcel to parcel.
See if Hydrangea will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether hydrangea actually takes — we score it against the real conditions at your address.
Three things about your exact spot that zone averages miss:
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Frequently Asked Questions
Can I grow Hydrangea in my zone?
Zone data for hydrangea is being finalized. A Growable Ground report checks your parcel's full suitability against federal soil, climate, and zone data.
When should you plant Hydrangea?
Most growers plant hydrangea after the last spring frost, once the soil has warmed, leaving enough of the season for its 120-day frost-free need. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
How much sun does Hydrangea need?
Hydrangea does well in partial sun — around 4 hours of direct sun, and it takes some afternoon shade in stride. That flexibility makes it a good match for a bed the house or a nearby tree shades for part of the day. A Growable Ground report maps how the sun actually falls on your land, hour by hour, so you can set it where the light lines up.
What soil does Hydrangea need?
Hydrangea prefers soil pH 5 to 7, on well-drained ground (USDA PLANTS Database). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Hydrangea attract pollinators?
Yes — hydrangea's flowers are a solid nectar source for honeybees and native bees (Xerces Society, Pollinator Partnership).
Is Hydrangea safe for pets?
Hydrangea is toxic to pets (dogs,cats,horses) with moderate severity. Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency.